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0. HEISLER. Electrical Annuno-iator.

Patented March 22, I881.

m GNP INVENTORZ- ATTEST:

UNITED STATES PATE T OFFICE.

CHARLES HEISLER, OF ST. LOUIS, MISSOURI.

ELECTRICAL ANNUNCIATOR.

SPECIFICATION forming part of Letters Patent No. 239,045, dated March 22, 1881.

Application filed February 10, 1880.

T all whom it may concern Be it known that I, CHARLES HEISLER, of the city of St. Louis, State of Missouri, have invented certain new and useful Improvements in Electric Indicators and Annunciators; and I do hereby declare that the follow ing is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

This invention consists, first, in the provision on the end of the pivoted lever that carries the signal-plates of a projecting spur which is engaged by a hook-piece on the end of the ar1nature-bar,s0 as to hold said signal-plates up in front of the openings of the indicator-face when the armature is not attracted by its magnet, but when attracted by the magnet will allow said plate to drop and indicate from whence the alarm has come; secondly, in sinking the letters or figures on the glass indicator-face from the back of the glass, so as to show a projecting letter from the front, the purpose being to prevent the reflection of the glass from interfering with the ready observation of the names or figures, the whole back of the glass being etched or frosted, except at the opening through which the signals are given, so as to prevent any reflection from the same.

In the drawings, Figure 1 is a front view of theindicator. Fig. 2 is a cross-section of the same. Fig. 3 is an enlarged detail section of the indicator-face.

In the drawings, A is the housing or casing of the indicator, of any suitable form and construction, in which is arranged the electro-magnets that operate the signal-plates B for the different rooms, 850. These plates are hung on the end of apivoted lever, B, which has at its other end a projecting spur, b, which is engaged by a hook-piece, c, on the end of a spring armature-bar, U, so that when the armature is not attracted by its electro-magnet O the signaling-plates B will be held up back of the transparent opening 01 of the indicatorface D, and when attracted by the electromagnet will release the lever and allow the same to drop with its signaling-plates to indicate from whence the alarm has come. The

armature is held" from moving too far forward by means of the stop a. r

In Fig. 2 of the drawings the signalingplate B is shown up in full lines and down in dotted lines. The signaling-plate B is weighted at its back so, as to lie plumb, no matter what its position is, and this may be accomplished by a separate weight, or when made of wood, as in the drawings, it can be formed with a thickened weighted portion, 12.

The face D of the indicator consists of a glass plate having transparent orifices d,iu front of the signaling-plates, the balance of the plate being rendered non-transparent by being etched or frosted and then covered with a coatingof paint or other substance; and in order to render said coating lasting I have embossed or thickened the glass at the portion d desired to be transparent, so that the coating will be .on or below a level of the same, as clearly indicated in Fig. 3. By this means there is no liability of the coating bein g rubbed off by the signal-plates, which are arranged to lie directly against the glass, so as to give a plain and distinct indication, which could notbe done were the plates any distance from the glass.

The figures or letters 01, used to indicate from whence the signal is given, are sunk into the indicator-face from its back, so as to show a raised letter from the front, the purpose being to show a clearindication, which is notinterfered with by reflection from the surface of theglass, no matter from what position the indicator is viewed.

I claim as my invention 1. The combination of signaling-plate B, pivoted at its upper edge to a lever, B, provided with a projecting spur, b, and a vertically-vibrating armature-bar, 0, having hookpiece 0, with an electro-magnet, U, stop-lug c, casing A, and glass face D, as and for the purpose set forth.

2. The combination, in an annunciator, of a glass face having its transparent portion raised or embossed, with asignaling-plate, B, arranged to lie directly against the glass face, as and for the purpose set forth.

3. The indicator-face having its back etched or frosted and covered'with a coating of paint or other substance, and its indicating letters or figures sunk from its back, as and for the purpose set forth.

CHARLES HEISLER.

Witnesses ROBERT BURNS, E. L. MORSE. 

